<template>
  <div class="person">
    <h1>情况一：监视【ref】定义的【基本类型】数据</h1>
    <h2>当前求和为: {{ sum }}</h2>
    <button @click="changeSum">点击改变sum</button>
  </div>
</template>

<script lang="ts" setup name="Person">
  import { ref, watch } from 'vue'
  // 数据
  let sum = ref(0)
  // 方法
  function changeSum() {
    sum.value += 1
  }
  // 监视 情况一：监视【ref】定义的【基本类型】数据
  const stopWatch = watch(sum, (newValue, oldValue) => {
    console.log('sum改变了', newValue, oldValue)
    if (newValue >= 10) {
      stopWatch()
    }
  })
</script> 

<style scoped>
  .person {
      background-color: skyblue;
      box-shadow: 0 0 10px;
      border-radius: 10px;
      padding: 20px;
  }

  button {
    margin: 0 5px;
  }
</style>